Play next video in TreeView

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C#

C#4.0

I am using wmp control to play my files. I am able to play the first file by clicking on it, and change the node to the next file after the first one ended, but I can't play the next video selecetd in the next node.
Can someone please help me fix this problem?
Here is my code:

private void list_AfterSelect(object sender, TreeViewEventArgs e)
        {
            player.Ctlcontrols.stop();
            player.close();
            directoryInfo = new DirectoryInfo(Directory.GetCurrentDirectory().ToString());            
            var directoryNode = new TreeNode(directoryInfo.Name);
            TreeNode Cnode = e.Node;
            String path2 = Cnode.FullPath;
            path.Text = path2;
            list.Visible = false;
            ruta = Path.GetFullPath(Path.GetFileName(Path.GetFileName(path.Text)));
            player.URL = Path.GetFullPath(Path.GetFileName(Path.GetFileName(path.Text)));
            directoryInfo = new DirectoryInfo(Directory.GetCurrentDirectory().ToString());
            player.Ctlcontrols.play();
        }
private void player_PlayStateChange(object sender, AxWMPLib._WMPOCXEvents_PlayStateChangeEvent e)
        {            
            if (player.playState == WMPLib.WMPPlayState.wmppsMediaEnded)
            {                                
                player.Ctlcontrols.stop();
                player.close();
                TreeNode obj = new TreeNode();
                obj = list.SelectedNode;                
                list.SelectedNode = obj.NextNode;
                player.URL = (Path.GetFullPath(Path.GetFileName(path.Text)));                
                player.Ctlcontrols.play();                              
            }